<!DOCTYPE html>
<html lang="zh">
	<head>
		<meta charset="UTF-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
		<meta http-equiv="X-UA-Compatible" content="ie=edge">
		<title></title>
	</head>
	<body>
		<!-- 
			1. 安装 babel-cli  babel-preset-env(预设包)  browserify(打包工具)(webpack)
				npm init -yes
				npm i babel-cli babel-preset-env browserify -D
				npx babel src/js -d dist/js --presets=babel-preset-env
			打包 npx browserify dist/js/19-2app.js -o dist/bundle.js
			
			修改源文件后  重新 转换和打包
		 -->
	</body>
	<script src="./dist/bundle.js" type="text/javascript"></script>
</html>